8张图理解Java - ImportNew



8张图理解Java - ImportNew

一图胜千言，下面图解均来自Program Creek 网站的Java教程，目前它们拥有最多的票选。如果图解没有阐明问题，那么你可以借助它的标题来一窥究竟。

1、字符串不变性

下面这张图展示了这段代码做了什么

1
2
String s = "abcd";
s = s.concat("ef");

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